Swords are the most widely equippable weapon type — most melee classes can carry one — which keeps demand broad across every level bracket.
Sword (Weapon)
Auction-house prices and price history for Sword in WoW Forever.
194 items in Weapons › Sword are currently auctionable in WoW Forever.
Prices refresh as beta players scan from players running the Booty Bay Broker companion, so a ruleset nobody has scanned yet carries no prices at all rather than stale ones.
Sword listings link to price-history pages with per-realm buyout, average, and median data for WoW Forever.